May wish to solve a static analysis first to verify that there are no To Perform a Dynamic Analysis / Eigensolution Any vertical loads that exist in theīe automatically converted to masses based on the acceleration of gravityĮntry on the Solution tab of the Model Settings. The program can also solve for an approximate type of eigenmode called a Ritz Vector.
Refer to the Program Limits section for information on the maximum number of modes that can be solved for in RISA. Referred to as eigenvalues and eigenvectors. For more information, see Dynamic Analysis - Response Spectra. Uses these frequencies to calculate forces, stresses and deflections in This is a prerequisite to the response spectra analysis, which Dynamic Analysis - Eigensolution Dynamic Analysis - EigensolutionĬalculates the modes and frequencies of vibration for the model.